No it was the Vikings. Spain claimed a lot of US territory.
"AI Overview
All the Spanish colonies in America. : r/MapPorn
Yes, Spain claimed a significant portion of what is now the United States. At its peak, Spain's North American empire included Florida, the Gulf Coast, and vast territories west of the Mississippi River, encompassing much of the modern-day southwestern United States, including California, Texas, Arizona, New Mexico, and parts of Colorado, Utah, and Nevada. "